Multiple choice

The Function of heavy water in a nuclear reactor is to

  1. Slow down the speed of neutrons.

  2. Increase the speed of neutrons.

  3. Coll down the reactor.

  4. Stop the nucleus reaction.
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A Correct answer
Explanation

The reaction can be controlled by using neutron poisons, which absorb excess neutrons such as boron and cadmium rods and neutron moderators, which reduce the velocity of fast neutrons.  Commonly used moderators include regular (light) water (75% of the world\'s reactors), solid graphite (20% of reactors) and heavy water (5% of reactors). Beryllium has also been used in some experimental types, and hydrocarbons have been suggested as another possibility.

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